John gbeives



'th oroughl JOHN eaniva s,

I IELE-CTRlCAL. l

of Paterson, county New.) ersey, have This in taining two Inpreparing mercial chalk and com portions.

For insulatmgcon able casing',

dampness, which and thus in; are

As the chalk is alk sists of acid element colopholic acid-a place between To all whom it may concern: Be it known that I,

zen of the United States,

box, or covering, mixture in the form of powder, especially in sition isnot exposed to the chalk is liable to absorb, the insulation;

cases where the compo the ingred chalk an D STATES SPECIFICATION forming part of Letters Patent Application filed]? JOHN Ganrvas, a citiresiding in of Passaic, and invented certain ne useful Improvements in Electrical JInsul Material, fully described and represented in thefollowing specification. I

vention consis ingredients, (black resin,) combined in the ma portions herein specified.

my comp tsin a composition cond colophony,

nner and proosition I take the commercial rosin and reduce them to powder and mix them in ductors inclosed i cases I prefer to melt the rosin and y with it while in a aline and suitable pron a suit- "can use the mix the chalk heated state.

the rosin cons--as pimc, sylvic,and

and a compound oflessentially d ertiesfrom either in the chalk and rosin gredi can both b ent results.

true chemical union takes ients when heated,

iti'erent prop- Thus ereadily cut ponderance of the chalk appears like an artificial stone much better than eith dients. I

In like manner is many grcllient ing the mixture.

The rosin having and resists we when chemically ar and PI'BSSUI'B very er ofthe separate ingrea very brittle nature, I find it preferahlefor most purposes to of the chalk, and employ fr per cent. of the latter, ness of the composition req compound is, to have a degreeo om fifty to ninety according to the hardulred.

the tenacity of the compound times greater than that of eitherincombined by heat- IISG an GXGGSS When the f flexibility I .013 PATEBSON, NE

ebruary 15, 1883.

the city an oxidizing-oil. State of when cold and nearly as tough w and so that it ating wires,

W JERSEY.

NSULATlNqMATERlAL- No. 278,536, dated May 29, 1883.

(No specimens.)

employ from thirty to forty-five per cent. of the rosin, and add also about five per cent. of Such compound is pliable as sole-leather, can be used for coating telegraphand resists flexure as well as a zinc or galvanized coating. I have not, however, claimed this subordinate or pliable mixture herein, but simply the composition of 0010- phony and chalk prepared as described above, and containing from forty to ninety per cent. of the chalk. The resisting-power of this insulating material is such that a film one-sixteenth of an inch thick will resist a current of fifteen amperes per second.

Any novel subject-matter I have described and not claimed herein I have claimed in other patent applications or reserved to be claimed in future original applications, and having thus set forth the nature of myinsulating composition, it will be seen that it differs from nothers previously patented in containing only the two ingredients, one of which is alkaline and the other acid, and that their chemical reaction isinot affected or confused by the presence of other elements when united in the simple manner I employ. Itherefore disclaim the use of chalk and rosin as heretofore used in compounds containing various other ingredients, my invention consisting in combining them in such a Way thattheir natural affinity may be utilized and the expense of other ingredients is avoided.

Having thus described myinvention,Iclaim the sameas follows:

The composition wires, consisting in chalk and colophony 00111- bined substantially in the manner and in the proportions specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing w-it nesses.

JOHN GREIVES. Witnesses;

THOS. S. CRANE, J can A. Ronareo.

for insulating electrical Correction in Letters Patent No. 278,536,

It is hereby certified that in Letters Patent No. 278,536, granted May 29, 1883, upon the application of John Greives, of Paterson, New Jersey, for an improvement in Electrical Insulating Material, an error appears in lines 59 and 60 of the printed specification forming a part of said patent requiring correction as follows: the word one-sixteenth should read one-sixtieth; and that the specification should be read with this correction therein to make it conform with the record of the case in the Patent Oflice.

Signed, conntersigned, and sealed this 26thday of June, A. D. 1883.

: [SEAL] M. L. JOSLYN,

Acting Secretary of the Interior. Gountersignecl:

v E.M. MARBLE,

Omnmissz'oner of Patents. 

